Converting An App
Converting an app to use South is very easy:
- Edit your settings.py and put 'south' into INSTALLED_APPS (assuming you've installed it to the right place)
- Run ./manage.py syncdb to load the South table into the database. Note that syncdb looks different now - South modifies it.
- Run ./manage.py convert_to_south myapp - South will automatically make and pretend to apply your first migration.
Note that you'll need to convert before you make any changes; South detects changes by comparing against the frozen state of the last migration, so it cannot detect changes from before you converted to using South.
Converting other installations and servers
The convert_to_south command only works entirely on the first machine you run it on. Once you've committed the initial migrations it made into your VCS, you'll have to run ./manage.py migrate myapp 0001 --fake on every machine that has a copy of the codebase (make sure they were up-to-date with models and schema first).
(For the interested, this is required because the initial migration that convert_to_south makes will try and create all the existing tables; instead, you tell South that it's already applied using --fake, so the next migrations apply correctly.)
Remember that new installations of the codebase after this don't need these steps; you need only do a syncdb then a normal migrate.
If you need to run the migrate command so that it will work for either situation, you can use ./manage.py migrate --autofake-first. For each app (or each app specified), this will fake the first migration if no migrations have yet been run for that app and if it detects that at least one table for the app has already been created.